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[ALICE3] oTOF: fix missing tilt shift for overlaps #15159

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[ALICE3] oTOF: fix missing tilt shift for overlaps #15159

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[ALICE3] oTOF: fix missing tilt shift for overlaps
njacazio Mar 13, 2026
e1f9750
Merge branch 'dev' into njacazio-patch-2
njacazio Mar 16, 2026
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23 changes: 9 additions & 14 deletions Detectors/Upgrades/ALICE3/IOTOF/simulation/src/Layer.cxx
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Original file line number Diff line number Diff line change
Expand Up @@ -155,17 +155,14 @@ void ITOFLayer::createLayer(TGeoVolume* motherVolume)
case kBarrelSegmented: {
// First we create the volume for the whole layer, which will be used as mother volume for the segments
const double avgRadius = 0.5 * (mInnerRadius + mOuterRadius);
const double staveSizeX = mStaves.second; // cm
const double staveSizeY = mOuterRadius - mInnerRadius; // cm
const double staveSizeZ = mZLength; // cm
const double rMargin = 0.2; // cm, a small margin to avoid layer extrusion by sub-volumes
const double deltaForTilt = rMargin + 0.5 * (std::sin(TMath::DegToRad() * mTiltAngle) * staveSizeX + std::cos(TMath::DegToRad() * mTiltAngle) * staveSizeY); // we increase the size of the layer to account for the tilt of the staves
const double staveSizeX = mStaves.second; // cm
const double staveSizeY = mOuterRadius - mInnerRadius; // cm
const double staveSizeZ = mZLength; // cm
const double deltaForTilt = 0.5 * (std::sin(TMath::DegToRad() * mTiltAngle) * staveSizeX + std::cos(TMath::DegToRad() * mTiltAngle) * staveSizeY); // we increase the size of the layer to account for the tilt of the staves
TGeoTube* layer = new TGeoTube(mInnerRadius - deltaForTilt, mOuterRadius + deltaForTilt, mZLength / 2);
TGeoVolume* layerVol = new TGeoVolume(mLayerName.c_str(), layer, medAir);
setLayerStyle(layerVol);

LOGP(info, "iTOF kBarrelSegmented layout: stave tilt angle {}, layer tube rMin {}, rMax {}", mTiltAngle, mInnerRadius - deltaForTilt, mOuterRadius + deltaForTilt);

// Now we create the volume for a single stave
TGeoBBox* stave = new TGeoBBox(staveSizeX * 0.5, staveSizeY * 0.5, staveSizeZ * 0.5);
TGeoVolume* staveVol = new TGeoVolume(staveName, stave, medAir);
Expand Down Expand Up @@ -290,17 +287,15 @@ void OTOFLayer::createLayer(TGeoVolume* motherVolume)
case kBarrelSegmented: {
// First we create the volume for the whole layer, which will be used as mother volume for the segments
const double avgRadius = 0.5 * (mInnerRadius + mOuterRadius);
const double rMargin = 0.8; // cm, a small margin to avoid layer extrusion by sub-volumes
TGeoTube* layer = new TGeoTube(mInnerRadius - rMargin, mOuterRadius + rMargin, mZLength / 2);
const double staveSizeX = mStaves.second; // cm
const double staveSizeY = mOuterRadius - mInnerRadius; // cm
const double staveSizeZ = mZLength; // cm
const double deltaForTilt = 0.5 * (std::sin(TMath::DegToRad() * mTiltAngle) * staveSizeX + std::cos(TMath::DegToRad() * mTiltAngle) * staveSizeY); // we increase the size of the layer to account for the tilt of the staves
TGeoTube* layer = new TGeoTube(mInnerRadius - deltaForTilt, mOuterRadius + deltaForTilt, mZLength / 2);
TGeoVolume* layerVol = new TGeoVolume(mLayerName.c_str(), layer, medAir);
setLayerStyle(layerVol);

LOGP(info, "oTOF kBarrelSegmented layout: stave tilt angle {}, layer tube rMin {}, rMax {}", mTiltAngle, mInnerRadius - rMargin, mOuterRadius + rMargin);

// Now we create the volume for a single stave
const double staveSizeX = mStaves.second; // cm
const double staveSizeY = mOuterRadius - mInnerRadius; // cm
const double staveSizeZ = mZLength; // cm
TGeoBBox* stave = new TGeoBBox(staveSizeX * 0.5, staveSizeY * 0.5, staveSizeZ * 0.5);
TGeoVolume* staveVol = new TGeoVolume(staveName, stave, medAir);
setStaveStyle(staveVol);
Expand Down
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